I just stumbled across another one: Films without families features works from Godard, Kusturica, Polanski and other acclaimed directors you won't find at your local blockbuster. The mission statement of the site is quite charming as well:

"Films Without Families offers you the chance to bring warmth and joy into the life of an unknown or abandoned film. By donating only a little bandwidth and a few hours of your time, you can make a difference!"